Container closure



May 13, 1930. MARSHALL 1,758,574

CONTAINER CLOSURE Filed Dec. 3, 1927 Patented May l3, 133i} ParentIIiIlEtAIhTII M. MARSHALL, OF LOS ANGELES, CALIFORNIA, ASSIGNOR OFONE-EALF TO FRANK S. LIVINGSTON, OF LOS ANGELES, CALIFORNIA CONTAINERCLOSURE Application filed December 3, 1927. Serial No. 237,422.

This invention relates to a closure for containers in general and moreparticularly pertains to a closure for the filler openings of tin cans.

' j An object of theinvention'is to provide a means for closing thefiller openings formed in the walls of containers whereby the 'maj orportion of the closure cap will be extended interiorly of the container,and connection be tween the cap and container so formed as to obviateany appreciable projection on the outer surface of the container due tosuch closure, and whercbythe joint between thecap and the container wallmay be readily rendered leakproof.

Another object is to provide a container closure which is renderedespecially suitable for use on tin cans employed in the packaging ofvolatiles, particularly the various hydrocarbon products such asgasoline, naphtha,

kerosene, and benzine, by reason of the closure being so formed thatpressures within the container will tend to tightenthe joint againstleakage.

Another object is to provide a container closure of the type inwhich acap is inserted in afiller opening in an inverted position and the sidewalls of the cap expanded to project beyond the margin of the filleropening interiorly of the container to cooperate with a lip on the capextending over the margin of the opening exteriorly of the container toretain the cap in place; in which the material of the cap and containerare collectively worked into intimate contact from the interior of thecap, and cooperating overlying and abutting converging walls formedbetween the cap and container interiorly of the latter tapering towardthe exterior thereof, whereby the cap,

though being put in place from the exterior of the container will seatoutwardly from the interior thereof. I

Another object is to provide a means whereby the cap will be maintainedin a seated po- 5 sition under tension and whereby the cap will;

be held in such frictional engagement with the can top as to inhibitrotation of the cap and whereby a tight joint will be maintained betweenthe cap and can top irrespective of any difference inexpansion andcontraction changes, and which will also obviate loosening of the capsdue to shocks imposed on the can during ordinary handling thereof.

With the foregoing objects in view together with such other objects andadvantages as may subsequently appear, the invention resides in thefeatures, and in the parts and combination, construction and arrangementof parts, hereinafter described and claimed and illustrated intheaccompanying drawing, in which:

Fig. 1 is a view of the closure cap as seenin side elevation partly insection; Fig. 2 is a view in cross section of a container wall takenthrough a filler opening; A

Fig. 3 is a view in section showing the cap as initially positioned inthe filler opening; 'Fig. 4 is a view in section and elevation showingthe complete closure;

Fig. 5 is a plan view of the completed closure; j

Fig 6 is an enlarged detail in sectionillustrating the manner ofeffecting inter-connection of the cap and container.

Referring to the drawing more specifically, V

the margin of which and extending perpendicular thereto is a side wall9. the upper.

margin of which is formed with an outward- .ly extending and downwardlyinclined lip 10. ,The outer periphery of the side wall 9 of the cap andthe inner periphery of the flange 7 are normally conformable to eachother; the cap being insertable throughthe opening C as shown in Fig. 3in which position the outer face ofthe side wall 9 will lie in contactwith the inner face of the flange. The side wall 9 is formed of a widthbetween the bottom wall 8 and the lip 10 relatively to the width of theflange 7 such-that when the cap is inserted in the filler opening withthe outer edge of the lip' 10 seating on the wall B, the lower edge ofthe flange 7 will lie on a plane approximately midway of the width ofthe side wall 9.

In eflecting inter-engagement of the cap and container wall, the'cap Ais placed in the filler opening C, as shown in Fig. 3,'with the marginof the downwardly inclined lip .10 seating on theupper face of the wallB whereupon a suitable mechanism is inserted in the cap and operated toeflect expansion of. the side wall 9 of the cap to spread the side wall.For this purpose, a tool or mechanism is employed embodying a plate D,which seats against the bottom wall 8 ofthe cap to hold the latteragainstmoving' upwardly and it also embodies one or more expandingrollers E,the peripheries of which are'crowned and are arranged to-bearagainst the inner face l of the side wall 9 in such position that,'intheexpanding operation, the material of the side -wall 9 will be initiallyworked outwardly medially thereof contiguous the lowerwedgeof the flange7. This forms the side wall 9 with 7 an enlarged diameter within thecontainer as indicated at a in Figs. 4 and 6 from which enlargement theside wall converges toward thebottom wall 8,.asindicated at 6,.andtoward the lip 10 as indicated at 0 thus forming the side wall of obtuseangled cross-sec tion, in this working of the material of'the sidewall9, the vflange 7 is worked outwardly together with the side wallportion 0 so as from being depressedinto the container.

By forming the lip 10 with the downward inclination, a clearance isprovided between V the margin ofthe lip and the wall 9 and a fullnessofthe cap materialis afforded which is taken up at least in part inexpandingthe side wall.

In thus expanding the side wall 9 and bringing the margin of the lip 10into conthe outer surface of the wall B,.as such would be liable toloosen the cap so that it would be. free to turn relative to the .wallB; an important feature of the present invention residing in forming thelip 10 cap upwardly and thereby maintain the latter in intimate contactwith the flange 7. This serves to hold the cap against turning and incooperation with the taper of thecap and its seat will act to compensatefor difference in expansion and contraction of the cap and container,and thereby serve to maintain a tight joint between the cap and thecontainer wall.

It will now be seen that on completion'of the connection betweenthe capand container, an intimate contact will be afforded between the flange 7and the side wall of the cap and that by reason of the tapered jointthus formed, pressure interiorly of the container will tend to force thecap tightly against its seat.

The materials of which the cap and flange are formed may be of anysuitable character .adaptedto be'worked in the fashion described thecontainer; ofa closure cap havinga bottom wall, a side wall ,formed incontinuation of the bottom .wall, and an outwardly extending lip onthe-margin of said side wall; said side wall beingexpanded together withsaid flange to diverge outwardly from the inner side of the containerwall, said lip extending downwardly "at aninclination with :its outermargin seating on the outerface of the con tainer wall and being placedunder tension. In testimony whereof, IhaveafliXed my signature. r

FRANK ,MARSHALL.

with a downward inclination or projection 7 so that when; its margin isbroughtinto contact with the wall B, and theside wall of the cap isdrawn into the container, the lip 10 willbe placed under tension so thatit will thenexert a spring action tending to pull the

